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CHAPTER 3 RESEARCH PROPOSAL Chapter 3 Research Proposal 3.1 ExperimentalScope CMAS-induced degradation is a serious issue for TBCs. Besides, sands and debris in the air, volcanic ash is also included in the CMAS category. Although the degradation of TBC by volcanic ash is really similar to that done by traditional CMAS, the degradation by volcanic ash goes much severer and their structure and composition are much more complicated than the traditional CMAS. Since the disruption of air travel and loss of 2 billion U.S. dollars associated with the eruption of Eyjafjallajökull volcano in Iceland in 2010 [54,65], materials scientists have been focusing on the effect of volcanic ash degradation. In this research, instead of formulating artificial CMAS compositions, real volcanic ash are utilized to simulate naturally occurring CMAS particles and understand the degradation effect of volcanic ash on the YSZ top coat. Corrosion and phase transformation-induced degradation of EB-PVD TBCs are studied in detail. The second half of the research focuses on engineering preventative techniques against volcanic ash attack by the sol-gel fabrication of metal-oxide Page 41PDF Image | Volcanic Ash Degradation on Thermal Barrier Coatings
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